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[net,v2] selftests: net: cope with slow env in gro.sh test

Message ID c777f75ac70e70aabf1398cefa5c51c0f4ea00f2.1707330768.git.pabeni@redhat.com
State Accepted
Commit e58779f47e5eeb4fc9e3707951b81fbe31de5e3b
Headers show
Series [net,v2] selftests: net: cope with slow env in gro.sh test | expand

Commit Message

Paolo Abeni Feb. 7, 2024, 6:36 p.m. UTC
The gro self-tests sends the packets to be aggregated with
multiple write operations.

When running is slow environment, it's hard to guarantee that
the GRO engine will wait for the last packet in an intended
train.

The above causes almost deterministic failures in our CI for
the 'large' test-case.

Address the issue explicitly ignoring failures for such case
in slow environments (KSFT_MACHINE_SLOW==true).

Fixes: 7d1575014a63 ("selftests/net: GRO coalesce test")
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
v1 -> v2:
  - replace the '-a' operator with '&&' - Mattbe

Note that the fixes tag is there mainly to justify targeting the net
tree, and this is aiming at net to hopefully make the test more stable
ASAP for both trees.

I experimented with a largish refactory replacing the multiple writes
with a single GSO packet, but exhausted by time budget before reaching
any good result.
---
 tools/testing/selftests/net/gro.sh | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Paolo Abeni Feb. 12, 2024, 8:40 a.m. UTC | #1
On Fri, 2024-02-09 at 11:15 -0800, Jakub Kicinski wrote:
> On Wed,  7 Feb 2024 19:36:46 +0100 Paolo Abeni wrote:
> > +    if [[ ${test} == "large" && -n "${KSFT_MACHINE_SLOW}" ]]; then
> > +        echo "Ignoring errors due to slow environment" 1>&2
> > +        exit_code=0
> > +    fi
> 
> Would it make sense to also add "&& $exit_code -ne 0" ?
> It may be useful to see in logs how many times we actually
> ignored the error?

Yep, I'll send a v3.

Thanks!

Paolo
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Patch

diff --git a/tools/testing/selftests/net/gro.sh b/tools/testing/selftests/net/gro.sh
index 19352f106c1d..3190b41e8bfc 100755
--- a/tools/testing/selftests/net/gro.sh
+++ b/tools/testing/selftests/net/gro.sh
@@ -31,6 +31,10 @@  run_test() {
       1>>log.txt
     wait "${server_pid}"
     exit_code=$?
+    if [[ ${test} == "large" && -n "${KSFT_MACHINE_SLOW}" ]]; then
+        echo "Ignoring errors due to slow environment" 1>&2
+        exit_code=0
+    fi
     if [[ "${exit_code}" -eq 0 ]]; then
         break;
     fi